WO2016060262A1 - タイヤ用ゴム組成物 - Google Patents
タイヤ用ゴム組成物 Download PDFInfo
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- WO2016060262A1 WO2016060262A1 PCT/JP2015/079366 JP2015079366W WO2016060262A1 WO 2016060262 A1 WO2016060262 A1 WO 2016060262A1 JP 2015079366 W JP2015079366 W JP 2015079366W WO 2016060262 A1 WO2016060262 A1 WO 2016060262A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L15/00—Compositions of rubber derivatives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/25—Incorporating silicon atoms into the molecule
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/30—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule
- C08C19/42—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with metals or metal-containing groups
- C08C19/44—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with metals or metal-containing groups of polymers containing metal atoms exclusively at one or both ends of the skeleton
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G61/02—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes
- C08G61/04—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes only aliphatic carbon atoms
- C08G61/06—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes only aliphatic carbon atoms prepared by ring-opening of carbocyclic compounds
- C08G61/08—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes only aliphatic carbon atoms prepared by ring-opening of carbocyclic compounds of carbocyclic compounds containing one or more carbon-to-carbon double bonds in the ring
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/548—Silicon-containing compounds containing sulfur
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2261/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G2261/40—Polymerisation processes
- C08G2261/41—Organometallic coupling reactions
- C08G2261/418—Ring opening metathesis polymerisation [ROMP]
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2261/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G2261/50—Physical properties
- C08G2261/60—Glass transition temperature
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2261/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G2261/70—Post-treatment
- C08G2261/72—Derivatisation
- C08G2261/726—Silylation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/006—Additives being defined by their surface area
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L65/00—Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain; Compositions of derivatives of such polymers
Definitions
- the present invention relates to a rubber composition for tires, and more specifically, a rubber composition for tires that can provide a rubber cross-linked product excellent in wear resistance (particularly, wear resistance in a low slip ratio region) and low heat build-up. Related to things.
- butadiene rubber and styrene butadiene rubber are widely used.
- Butadiene the raw material for butadiene rubber and styrene-butadiene rubber, is produced as a by-product in the production of ethylene by naphtha cracking.
- natural gas such as ethane is used as a raw material as a method for producing ethylene.
- butadiene production is expected to decrease. For this reason, various studies have been conducted on the use of a synthetic rubber that does not use butadiene as a substitute material for butadiene rubber or styrene butadiene rubber.
- Patent Document 1 discloses that a functional group is introduced into a terminal of a cyclopentene ring-opening polymer by ring-opening polymerization of cyclopentene in the presence of a compound having a functional group and an ethylenically unsaturated bond, thereby opening cyclopentene.
- a technique for improving the affinity between the ring polymer and the inorganic particles has been proposed.
- Patent Document 2 proposes a technique for improving the affinity between a cyclopentene ring-opening polymer and inorganic particles by bonding an alkoxysilyl group to the end of a polymer chain via a urethane bond group.
- Patent Document 3 30% by weight or more of a terminal modified group-containing conjugated diene copolymer having a terminal modified is used as a rubber composition for the purpose of improving wear resistance and low heat build-up.
- a rubber composition for tire treads containing a diene rubber, silica, carbon black, and a specific silane coupling agent has been proposed.
- JP 2010-37362 A International Publication No. 2012/043802 Japanese Patent No. 5429255
- Patent Document 3 aims to prevent wear (specifically, wear during starting or braking) under high slip rate conditions (specifically, conditions with a slip rate of 25%). Therefore, the effect of suppressing wear in a region with a low slip rate (specifically, wear during normal running) was not sufficient.
- wear that occurs in a low slip ratio region that is, a region where the level of frictional energy is low, is well correlated with wear in a real vehicle, and from the viewpoint of preventing wear in a real vehicle. It is important to suppress wear in a region where the slip ratio is low.
- the present invention has been made in such a situation, and the object thereof is to provide a rubber cross-linked product excellent in wear resistance (particularly, wear resistance in a region having a low slip rate) and low heat build-up.
- the object is to provide a rubber composition for a tire.
- the present inventors have obtained a terminal-modified group-containing cyclic olefin ring-opening polymer having a glass transition temperature of ⁇ 120 to ⁇ 90 ° C., and a glass transition obtained by solution polymerization.
- a terminal-modified group-containing solution-polymerized conjugated diene polymer having a temperature of ⁇ 60 to ⁇ 10 ° C. and a content of aromatic vinyl monomer units of more than 30% by weight and 50% by weight or less at a predetermined ratio.
- the terminal-modified group-containing cyclic olefin ring-opening polymer having a glass transition temperature of ⁇ 120 to ⁇ 90 ° C. is 15 to 55% by weight, the glass transition temperature is ⁇ 60 to ⁇ 10 ° C.
- a silane coupling agent containing a group and / or a thiol group, the silica content is 30 to 200 parts by weight with respect to 100 parts by weight of the rubber component, and the monosulfide group with respect to 100 parts by weight of the silica And / or a tire rubber composition having a silane coupling agent-containing thiol group content of 0.3 to 20 parts by weight.
- the terminal-modified group-containing cyclic olefin ring-opening polymer is preferably a polymer in which an oxysilyl group is introduced at the end of a polymer chain.
- the terminal-modified group-containing solution-polymerized conjugated diene polymer is represented by the following general formulas (1) to (3) in a solution-polymerized conjugated diene polymer chain having an active terminal.
- these compounds those having a group introduced by reacting at least one compound are preferable.
- R 1 to R 8 are an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms, and these may be the same as or different from each other.
- X 1 and X 4 are a functional group capable of reacting with the active end of the polymer chain, an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and X 1 and X 4 are the same as each other
- X 2 is a functional group capable of reacting with the active end of the polymer chain
- X 3 is a group containing 2 to 20 alkylene glycol repeating units.
- R 9 to R 16 are an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms, which may be the same or different from each other.
- X 5 to X 8 are functional groups capable of reacting with the active end of the polymer chain.
- R 17 to R 19 are an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms, and these may be the same or different from each other.
- X 9 to X 11 are functional groups capable of reacting with the active end of the polymer chain, and s is an integer of 1 to 18.
- the terminal-modified group-containing solution-polymerized conjugated diene polymer preferably contains 1,3-butadiene units and isoprene units as conjugated diene monomer units.
- the silica preferably has a nitrogen adsorption specific surface area of 50 to 300 m 2 / g.
- the tire rubber composition preferably further contains 1 to 150 parts by weight of carbon black with respect to 100 parts by weight of the rubber component.
- a rubber cross-linked product obtained by cross-linking the above-described tire rubber composition, and a tire comprising the rubber cross-linked product.
- a rubber composition for a tire that can provide a rubber cross-linked product excellent in wear resistance (particularly, wear resistance in a low slip ratio region) and low heat build-up.
- the tire rubber composition of the present invention is obtained by solution polymerization with 15 to 55% by weight of a terminally modified group-containing cyclic olefin ring-opening polymer having a glass transition temperature of ⁇ 120 to ⁇ 90 ° C., and the glass transition temperature is ⁇
- a component, silica, and a silane coupling agent containing a monosulfide group and / or a thiol group The content of the silica is 30 to 200 parts by weight with respect to 100 parts by weight of the rubber component, and the content of the silane coupling agent containing the monosulfide group and / or thiol group with respect to 100 parts by weight of the silica is 0.00.
- the rubber composition is 3 to 20 parts by weight.
- the terminal-modified group-containing cyclic olefin ring-opening polymer contained as an essential component in the tire rubber composition of the present invention is a repeating unit formed by ring-opening polymerization of a cyclic olefin as a repeating unit constituting the main chain thereof.
- the cyclic olefin for forming the terminally modified group-containing cyclic olefin ring-opening polymer used in the present invention is not particularly limited, and examples thereof include monocyclic olefins, monocyclic dienes, monocyclic trienes and polycyclic cyclic olefins, Examples include polycyclic cyclic dienes and polycyclic cyclic trienes.
- Examples of the monocyclic olefin include cyclopentene which may have a substituent and cyclooctene which may have a substituent.
- Examples of the monocyclic diene include 1,5-cyclooctadiene which may have a substituent.
- Examples of the monocyclic triene include 1,5,9-cyclododecatriene which may have a substituent.
- Examples of the polycyclic olefin include norbornene compounds which may have a substituent.
- cyclopentene is preferred, and the terminally modified group-containing cyclic olefin ring-opening polymer used in the present invention is a polymer consisting only of a cyclopentene unit or a cyclopentene unit and a cyclopentene as a repeating unit constituting the main chain. It is preferable that it is a copolymer consisting of monomer units copolymerizable with.
- the ratio of the cyclopentene unit in the terminally modified group-containing cyclic olefin ring-opening polymer used in the present invention is preferably 80 mol% or more, more preferably 85 mol% or more, and 90 mol% or more. More preferably.
- the molecular weight of the terminally modified group-containing cyclic olefin ring-opening polymer used in the present invention is not particularly limited, but the weight average molecular weight (Mw) in terms of polystyrene measured by gel permeation chromatography is 100,000 to It is preferably 1,000,000, more preferably 150,000 to 900,000, and even more preferably 200,000 to 800,000.
- Mw weight average molecular weight
- the terminal modified group-containing cyclic olefin ring-opening polymer has such a molecular weight, it becomes possible to give a rubber cross-linked product having excellent mechanical properties.
- Mn number average molecular weight
- Mw weight average molecular weight
- Mw weight average molecular weight
- the cis / trans ratio is not particularly limited, but is usually in the range of 10/90 to 90/10. From the viewpoint of obtaining a rubber composition for tires that can give a rubber cross-linked product exhibiting excellent properties at low temperatures, it is preferably in the range of 30/70 to 90/10, and 40/60 to A range of 90/10 is more preferable.
- the glass transition temperature of the terminally modified group-containing cyclic olefin ring-opening polymer used in the present invention is ⁇ 120 to ⁇ 90 ° C., preferably ⁇ 117 to ⁇ 95 ° C., more preferably ⁇ 115 to ⁇ 100 ° C. If the glass transition temperature is too low, the resulting rubber cross-linked product may be inferior in the balance between the wet grip performance and the low-temperature characteristics, while if the glass transition temperature is too high, the embrittlement temperature when the rubber composition is formed becomes too high. It becomes high and is inferior to low temperature characteristics.
- the glass transition temperature of the terminally modified group-containing cyclic olefin ring-opening polymer can be adjusted, for example, by adjusting the cis / trans ratio in the double bond present in the repeating unit.
- the terminally modified group-containing cyclic olefin ring-opening polymer used in the present invention may have a melting point.
- the temperature is preferably 0 ° C. or lower, more preferably ⁇ 10 ° C. or lower.
- the presence or absence of the melting point of the terminally modified group-containing cyclic olefin ring-opening polymer, and the temperature in the case of having the melting point, can be adjusted by adjusting the cis / trans ratio in the double bond present in the repeating unit. it can.
- the terminal modified group-containing cyclic olefin ring-opening polymer used in the present invention has a modified group at the end of the polymer chain, and such a modified group is not particularly limited, but is a group 15 atom of the periodic table. And a functional group containing an atom selected from the group consisting of a group 16 atom of the periodic table and a silicon atom.
- a modified group is not particularly limited, but is a group 15 atom of the periodic table.
- a functional group for forming a terminal-modified group it is possible to increase the affinity for silica, and from this, it is possible to further improve the wear resistance and low heat build-up of the resulting rubber cross-linked product.
- a functional group containing an atom selected from the group consisting of a nitrogen atom, an oxygen atom, a phosphorus atom, a sulfur atom, and a silicon atom is more preferable.
- a functional group selected from the group consisting of a nitrogen atom, an oxygen atom, and a silicon atom is selected. More preferred are functional groups containing such atoms.
- Examples of the functional group containing a nitrogen atom include an amino group, a pyridyl group, an imino group, an amide group, a nitro group, a urethane bonding group, and a hydrocarbon group containing these groups.
- Examples of the functional group containing an oxygen atom include a hydroxyl group, a carboxylic acid group, an ether group, an ester group, a carbonyl group, an aldehyde group, an epoxy group, or a hydrocarbon group containing these groups.
- Examples of the functional group containing a silicon atom include an alkylsilyl group, an oxysilyl group, a silanol group, or a hydrocarbon group containing these groups.
- Examples of the functional group containing a phosphorus atom include a phosphate group, a phosphino group, or a hydrocarbon group containing these groups.
- Examples of the functional group containing a sulfur atom include a sulfonyl group, a thiol group, a thioether group, or a hydrocarbon group containing these groups.
- the modifying group may be a functional group containing a plurality of the above groups.
- specific examples of functional groups that are particularly suitable from the viewpoint of further improving the wear resistance and low heat build-up of the resulting rubber cross-linked product include amino groups, pyridyl groups, imino groups, and amide groups. , Hydroxyl groups, carboxylic acid groups, aldehyde groups, epoxy groups, oxysilyl groups, silanol groups, or hydrocarbon groups containing these groups, with oxysilyl groups being particularly preferred.
- the terminal modified group-containing cyclic olefin ring-opening polymer used in the present invention has both polymer chain ends (both ends) even if a modified group is introduced only at one polymer chain end (one end).
- the modified group may be introduced in the mixture, or these may be mixed.
- the method for synthesizing the terminally modified group-containing cyclic olefin ring-opening polymer used in the present invention is not particularly limited as long as the target polymer is obtained, but may be synthesized according to a conventional method. It can be synthesized by the method.
- the terminally modified group-containing cyclic olefin ring-opening polymer used in the present invention includes, for example, a periodic table group 6 transition metal compound (A) and an organoaluminum compound (B) represented by the following formula (4). It can be obtained by ring-opening polymerization of a cyclic olefin in the presence of a polymerization catalyst.
- R 21 3-p Al (OR 22 ) p (4)
- R 21 and R 22 represent a hydrocarbon group having 1 to 20 carbon atoms, and p is 0 ⁇ p ⁇ 3.
- the periodic table group 6 transition metal compound (A) is a compound having a periodic table (long period type periodic table, hereinafter the same) group 6 transition metal atom, specifically, a chromium atom, a molybdenum atom, or a tungsten atom.
- a compound having a molybdenum atom or a compound having a tungsten atom is preferable, and a compound having a tungsten atom is more preferable from the viewpoint of high solubility in a cyclic olefin.
- the group 6 transition metal compound (A) in the periodic table is not particularly limited as long as it is a compound having a group 6 transition metal atom in the periodic table. , Arylates, oxydides, and the like. Among these, halides are preferable from the viewpoint of high polymerization activity.
- Group 6 transition metal compound (A) include molybdenum compounds such as molybdenum pentachloride, molybdenum oxotetrachloride, and molybdenum (phenylimide) tetrachloride; tungsten hexachloride, tungsten oxotetrachloride, Tungsten compounds such as tungsten (phenylimido) tetrachloride, monocatecholate tungsten tetrachloride, bis (3,5-ditertiarybutyl) catecholate tungsten dichloride, bis (2-chloroetherate) tetrachloride, tungsten oxotetraphenolate ;
- molybdenum compounds such as molybdenum pentachloride, molybdenum oxotetrachloride, and molybdenum (phenylimide) tetrachloride
- tungsten hexachloride such as moly
- the use amount of the Group 6 transition metal compound (A) in the periodic table is usually 1: 100 to 1: 200,000, preferably 1 in terms of the molar ratio of “Group 6 transition metal atom in the polymerization catalyst: cyclic olefin”. : 200 to 1: 150,000, more preferably in the range of 1: 500 to 1: 100,000.
- a polymerization reaction may not fully advance.
- removal of the catalyst residue from the cyclic olefin ring-opening polymer becomes difficult, and the heat resistance and cold resistance of the resulting rubber cross-linked product may be lowered.
- the organoaluminum compound (B) is a compound represented by the above formula (4).
- Specific examples of the hydrocarbon group having 1 to 20 carbon atoms represented by R 21 and R 22 in the formula (4) include a methyl group, an ethyl group, an isopropyl group, an n-propyl group, an isobutyl group, and an n-butyl group.
- Alkyl groups such as t-butyl group, n-hexyl group and cyclohexyl group; aryl groups such as phenyl group, 4-methylphenyl group, 2,6-dimethylphenyl group, 2,6-diisopropylphenyl group and naphthyl group; Etc.
- the groups represented by R 21 and R 22 may be the same or different, but in the present invention, the obtained cyclic olefin ring-opening weight from the viewpoint of being able to increase the cis ratio of coalescence of R 21 and R 22, at least R 22 is preferably an alkyl group formed by bonding continuously carbon atoms 4 or more, in particular, n- butyl And more preferably a 2-methyl-pentyl group, an n-hexyl group, a cyclohexyl group, an n-octyl group, or an n-decyl group.
- p is 0 ⁇ p ⁇ 3. That is, in the above formula (4), the composition ratio between R 21 and OR 22 can take any value in the ranges of 0 ⁇ 3-p ⁇ 3 and 0 ⁇ p ⁇ 3, respectively. However, x is preferably 0.5 ⁇ p ⁇ 1.5 from the viewpoint that the polymerization activity can be increased and the cis ratio of the obtained cyclic olefin ring-opening polymer can be increased.
- the organoaluminum compound (B) represented by the above formula (4) can be synthesized, for example, by a reaction of a trialkylaluminum and an alcohol, as shown in the following formula (5).
- p in the above formula (4) can be arbitrarily controlled by defining the reaction ratio of the corresponding trialkylaluminum and alcohol as shown in the above formula (5).
- an organoaluminum compound (B) changes also with kinds of the organoaluminum compound (B) to be used, with respect to the periodic table group 6 transition metal atom which comprises a periodic table group 6 transition metal compound (A).
- the ratio is preferably 0.1 to 100 times mol, more preferably 0.2 to 50 times mol, and still more preferably 0.5 to 20 times mol. If the amount of the organoaluminum compound (B) used is too small, the polymerization activity may be insufficient, and if it is too large, side reactions tend to occur during ring-opening polymerization.
- the polymerization catalyst includes esters and / or Or you may contain ethers (C) further.
- esters and / or ethers (C) include ethers such as diethyl ether, tetrahydrofuran, ethylene glycol diethyl ether, 1,4-dioxane; ethyl acetate, butyl acetate, amyl acetate, octyl acetate, acetic acid 2 -Esters such as chloroethyl, methyl acetyl acrylate, ⁇ -caprolactone, dimethyl glutarate, ⁇ -heisanolactone, diacetoxyethane, and the like.
- 1,4-dioxane and ethyl acetate are preferable from the viewpoint that the addition effect can be further enhanced.
- These esters and / or ethers (C) can be used alone or in combination of two or more.
- the method for carrying out the ring-opening polymerization is not particularly limited.
- a method of carrying out ring-opening polymerization of a cyclic olefin by adding a Group 6 transition metal compound (A) can be mentioned.
- the Group 6 transition metal compound (A) of the periodic table and the esters or ethers (C) used as necessary are mixed in advance, a cyclic olefin is added thereto, and then the organoaluminum compound (B) ) May be added to carry out ring-opening polymerization of the cyclic olefin.
- a periodic table group 6 transition metal compound (A) and an organoaluminum compound (B), and if necessary, esters and / or ethers (C) are mixed in advance, and a cyclic olefin is added thereto. By adding, ring-opening polymerization of a cyclic olefin may be performed.
- the cleavage ring polymerization reaction may be performed without a solvent or in a solution.
- the solvent used when the ring-opening polymerization reaction is performed in a solution is not particularly limited as long as it is inactive in the polymerization reaction and can dissolve the cyclic olefin used in the ring-opening polymerization or the above-described polymerization catalyst.
- hydrocarbon solvent examples include, for example, aromatic hydrocarbons such as benzene, toluene, xylene, and ethylbenzene; aliphatic hydrocarbons such as n-hexane, n-heptane, and n-octane; cyclohexane, cyclopentane, and methyl And alicyclic hydrocarbons such as cyclohexane.
- halogen-based solvent include alkyl halogens such as dichloromethane and chloroform; aromatic halogens such as chlorobenzene and dichlorobenzene.
- a modifying group can be introduced at the end of the polymer chain. For example, when it is desired to introduce an oxysilyl group into the polymer chain end of the cyclic olefin ring-opening polymer, an oxysilyl group-containing olefinically unsaturated hydrocarbon may be present in the polymerization reaction system.
- vinyl (trimethoxy) silane is introduced as a modified group introduced only at one end (one end) of a polymer chain of a cyclic olefin ring-opening polymer.
- 1,4-bis (trimethoxysilyl) -2-butene 1,4-bis ( Alkoxysilane compounds such as triethoxysilyl) -2-butene and 1,4-bis (trimethoxysilylmethoxy) -2-butene; aryloxysilane compounds such as 1,4-bis (triphenoxysilyl) -2-butene
- An acyloxysilane compound such as 1,4-bis (triacetoxysilyl) -2-butene; an alkylsiloxysilane compound such as 1,4-bis [tris (trimethylsiloxy) silyl] -2-butene;
- Arylsiloxysilane compounds such as bis [tris (triphenylsiloxy) silyl] -2-butene; 1,4-bis (heptamethyltrisiloxy)
- the amount of the functional group-containing olefinically unsaturated hydrocarbon such as an oxysilyl group-containing olefinically unsaturated hydrocarbon may be appropriately selected according to the molecular weight of the terminally modified group-containing cyclic olefin ring-opening polymer to be produced.
- the molar ratio with respect to olefin is usually 1/100 to 1 / 100,000, preferably 1/200 to 1 / 50,000, more preferably 1/500 to 1 / 10,000.
- the functional group-containing olefinically unsaturated hydrocarbon acts as a molecular weight regulator in addition to the action of introducing a modifying group into the polymer chain end of the cyclic olefin ring-opening polymer.
- the polymerization reaction temperature is not particularly limited, but is preferably ⁇ 100 ° C. or higher, more preferably ⁇ 50 ° C. or higher, still more preferably 0 ° C. or higher, and particularly preferably 20 ° C. or higher.
- the upper limit of the polymerization reaction temperature is not particularly limited, but is preferably less than 100 ° C, more preferably less than 90 ° C, still more preferably less than 80 ° C, and particularly preferably less than 70 ° C.
- the polymerization reaction time is not particularly limited, but is preferably 1 minute to 72 hours, more preferably 10 minutes to 20 hours.
- An anti-aging agent such as a phenol-based stabilizer, a phosphorus-based stabilizer, or a sulfur-based stabilizer may be added to the terminally modified group-containing cyclic olefin ring-opened polymer obtained by the soot polymerization reaction. What is necessary is just to determine suitably the addition amount of an anti-aging agent according to the kind etc. Furthermore, you may mix
- a known recovery method may be employed to recover the polymer from the polymer solution. For example, a solvent such as steam stripping may be used. After separating the solid, the solid can be filtered off and dried to obtain a solid rubber.
- the rubber composition for tires of the present invention comprises a terminal-modified group-containing solution-polymerized conjugated diene polymer in addition to the terminal-modified group-containing cyclic olefin ring-opening polymer that can be obtained as described above. It is.
- the terminal-modified group-containing solution-polymerized conjugated diene polymer contained as an essential component is obtained by dissolving a monomer mixture containing a conjugated diene monomer as a main component in a solvent.
- a polymer obtained by polymerization in a state of being polymerized (that is, a polymer obtained by solution polymerization), having a glass transition temperature of ⁇ 60 to ⁇ 10 ° C., and a content ratio of aromatic vinyl monomer units Is more than 30% by weight and not more than 50% by weight, and contains a terminal modifying group.
- a terminal-modified group-containing solution-polymerized conjugated diene polymer is used in combination with a terminal-modified group-containing cyclic olefin ring-opening polymer, and silica and monosulfide groups described later.
- a rubber cross-linked product excellent in wear resistance and low heat build-up By blending a silane coupling agent containing a thiol group at a predetermined ratio, a rubber cross-linked product excellent in wear resistance and low heat build-up can be provided.
- a terminally modified group-containing solution-polymerized conjugated diene polymer obtained by solution polymerization when a conjugated diene polymer obtained by emulsion polymerization is used, such wear resistance and low heat generation properties are obtained. The improvement effect cannot be obtained.
- the terminally modified group-containing solution polymerized conjugated diene polymer used in the present invention has a conjugated diene monomer unit and an aromatic vinyl monomer unit as essential monomer units.
- the conjugated diene monomer that forms the conjugated diene monomer unit is not particularly limited.
- 1,3-butadiene, isoprene (2-methyl-1,3-butadiene), 2,3-dimethyl-1 1,3-butadiene, 2-chloro-1,3-butadiene, 1,3-pentadiene, 1,3-hexadiene, and the like can be used.
- 1,3-butadiene and isoprene are preferable, and it is more preferable to use 1,3-butadiene and isoprene in combination.
- These conjugated diene monomers can be used alone or in combination of two or more.
- the aromatic vinyl monomer that forms the aromatic vinyl monomer unit is not particularly limited, and examples thereof include styrene, ⁇ -methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2,4-diisopropylstyrene, 2,4-dimethylstyrene, 4-t-butylstyrene, 5-t-butyl-2-methylstyrene, vinylnaphthalene, Dimethylaminomethylstyrene, dimethylaminoethylstyrene, etc. can be used. Among these, styrene, ⁇ -methylstyrene, and 4-methylstyrene are preferable, and styrene is more preferable. These aromatic vinyl monomers can be used alone or in combination of two or more.
- the terminal-modified group-containing solution-polymerized conjugated diene polymer used in the present invention is a single aromatic vinyl monomer from the viewpoint that the resulting rubber cross-linked product can be excellent in wear resistance and low heat build-up.
- the content ratio of the body unit is more than 30% by weight and 50% by weight or less, preferably 33 to 48% by weight, more preferably Is 35 to 45% by weight.
- the wear performance means wear occurring in a region (low severity) where the level of energy (friction energy) for wearing the tire is low. It is known that the wear that occurs in a low level region correlates with the wear in an actual vehicle. In order to evaluate the wear resistance performance in the wear generated in such a low friction energy region, it is necessary to perform a wear test in the low friction energy region. Specifically, it is set based on the following equation: It is necessary to perform the wear test under the condition that the slip ratio to be set is as small as about 1 to 5%.
- An example of a wear tester capable of performing a wear test under such a condition that the slip ratio is set small is an FPS wear tester manufactured by Ueshima Seisakusho.
- Slip rate (Vs ⁇ Vd) ⁇ Vs ⁇ 100 (%)
- Vs Speed of peripheral surface of rubber test piece (peripheral speed) (cm / min)
- Vd grinding wheel peripheral speed (cm / min)
- the Mooney viscosity (ML 1 + 4 , 100 ° C.) of the terminal-modified group-containing solution-polymerized conjugated diene polymer used in the present invention is not particularly limited, but is preferably 20 to 90, more preferably 30 to 80.
- the glass transition temperature of the terminally modified group-containing solution-polymerized conjugated diene polymer used in the present invention is ⁇ 60 to ⁇ 10 ° C., preferably ⁇ 50 to ⁇ 15 ° C., more preferably ⁇ 40 to ⁇ 20 ° C. It is. If the glass transition temperature of the terminally modified group-containing solution-polymerized conjugated diene polymer is too low, the resulting rubber cross-linked product will not have the effect of improving wear resistance and wet grip properties, while if the glass transition temperature is too high. Inferior to low heat generation.
- the terminally modified group-containing solution polymerization conjugated diene polymer used in the present invention has a modifying group at the end of the polymer chain.
- a modifying group is not particularly limited, but contains a silicon atom.
- the functional group is preferably a modified group formed by reacting a silane compound represented by the following general formulas (1) to (3).
- the method for introducing a modifying group at the end of the polymer chain is not particularly limited.
- a solution-polymerized conjugated diene polymer chain having an active end is obtained by solution polymerization, and the modifying group is introduced at the active end.
- a method of reacting with a modifying agent for example, a method of reacting with a modifying agent.
- terminal-modified group-containing solution-polymerized conjugated diene polymer used in the present invention may be a so-called oil-extended rubber in which an extending oil is blended.
- a method for producing a terminally modified group-containing solution-polymerized conjugated diene polymer used in the present invention for example, a monomer mixture containing a conjugated diene monomer and an aromatic vinyl monomer in an inert solvent, It can manufacture by obtaining the polymer chain which has an active terminal by superposing
- the inert solvent used is not particularly limited as long as it is usually used in solution polymerization and does not inhibit the polymerization reaction. Specific examples thereof include, for example, aliphatic hydrocarbons such as butane, pentane, hexane and 2-butene; alicyclic hydrocarbons such as cyclopentane, cyclohexane and cyclohexene; aromatic carbonization such as benzene, toluene and xylene. Hydrogen; The amount of the inert solvent used is such that the monomer concentration is usually 1 to 50% by weight, preferably 10 to 40% by weight.
- the polymerization initiator is not particularly limited as long as it can polymerize a monomer mixture containing a conjugated diene monomer and an aromatic vinyl monomer to give a polymer chain having an active end.
- a polymerization initiator having an organic alkali metal compound, an organic alkaline earth metal compound, or a lanthanum series metal compound as a main catalyst is preferably used.
- organic alkali metal compound examples include, for example, organic monolithium compounds such as n-butyllithium, sec-butyllithium, t-butyllithium, hexyllithium, phenyllithium, stilbenelithium; dilithiomethane, 1,4-dilithiobutane, Examples thereof include organic polyvalent lithium compounds such as 1,4-dilithio-2-ethylcyclohexane and 1,3,5-trilithiobenzene; organic sodium compounds such as sodium naphthalene; and organic potassium compounds such as potassium naphthalene.
- organic monolithium compounds such as n-butyllithium, sec-butyllithium, t-butyllithium, hexyllithium, phenyllithium, stilbenelithium
- dilithiomethane 1,4-dilithiobutane
- organic polyvalent lithium compounds such as 1,4-dilithio-2-ethylcyclohex
- organic alkaline earth metal compound examples include n-butylmagnesium, n-hexylmagnesium, ethoxycalcium, calcium stearate, t-butoxystrontium, ethoxybarium, isopropoxybarium, ethyl mercaptobarium, t-butoxybarium, and phenoxybarium. , Diethylamino barium, barium stearate, ketyl barium and the like.
- a lanthanum series metal salt composed of a lanthanum series metal such as lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, carboxylic acid, phosphorus-containing organic acid, etc. is used as a main catalyst.
- a polymerization initiator comprising this and a promoter such as an alkylaluminum compound, an organoaluminum hydride compound, and an organoaluminum halide compound.
- an organic lithium compound particularly an organic monolithium compound.
- the organic alkali metal compound includes a secondary amine such as dibutylamine, dihexylamine, dibenzylamine, pyrrolidine, hexamethyleneimine, heptamethyleneimine (preferably pyrrolidine, hexamethyleneimine, heptamethyleneimine) and the like. You may make it react and use as an organic alkali metal amide compound.
- These polymerization initiators can be used alone or in combination of two or more.
- the amount of the polymerization initiator used is usually in the range of 1 to 50 mmol, preferably 2 to 20 mmol, more preferably 4 to 15 mmol per 1000 g of the monomer mixture used for the polymerization.
- a polar compound in order to adjust the vinyl bond content of the conjugated diene monomer unit, when polymerizing the monomer mixture, it is preferable to add a polar compound to an inert solvent used for the polymerization.
- the polar compound include ether compounds such as dibutyl ether, tetrahydrofuran and ditetrahydrofurylpropane; tertiary amines such as tetramethylethylenediamine; alkali metal alkoxides; phosphine compounds. Of these, ether compounds and tertiary amines are preferred, tertiary amines are more preferred, and tetramethylethylenediamine is particularly preferred.
- the amount of the polar compound used is preferably in the range of 0.01 to 100 mol, more preferably 0.3 to 30 mol, relative to 1 mol of the polymerization initiator. When the amount of the polar compound used is within this range, it is easy to adjust the vinyl bond content of the conjugated diene monomer unit, and problems due to the deactivation of the polymerization initiator hardly occur.
- the polymerization temperature is usually in the range of ⁇ 78 to 150 ° C., preferably 0 to 100 ° C., more preferably 30 to 90 ° C.
- any of batch mode and continuous mode can be adopted.
- the terminal chain-modified group-containing solution-polymerized conjugated diene polymer used in the present invention is obtained by reacting a polymer chain having an active terminal obtained by such a polymerization reaction with a modifier to introduce a modifying group.
- the modifier is not particularly limited, but from the viewpoint that the wear resistance and low heat build-up of the resulting rubber cross-linked product can be further improved, the silane compound represented by the following general formulas (1) to (3) Among these, it is preferable to use at least one silane compound.
- R 1 to R 8 are an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms, and these may be the same as or different from each other.
- X 1 and X 4 are a functional group capable of reacting with the active end of the polymer chain, an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and X 1 and X 4 are the same as each other
- X 2 is a functional group capable of reacting with the active end of the polymer chain
- X 3 is a group containing 2 to 20 alkylene glycol repeating units.
- R 9 to R 16 are an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms, which may be the same or different from each other.
- X 5 to X 8 are functional groups capable of reacting with the active end of the polymer chain.
- R 17 to R 19 are an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms, and these may be the same or different from each other.
- X 9 to X 11 are functional groups capable of reacting with the active end of the polymer chain, and s is an integer of 1 to 18.
- examples of the alkyl group having 1 to 6 carbon atoms constituting R 1 to R 8 , X 1 and X 4 include, for example, methyl group, ethyl group, n- Examples include propyl group, isopropyl group, butyl group, pentyl group, hexyl group, cyclohexyl group and the like.
- Examples of the aryl group having 6 to 12 carbon atoms include a phenyl group and a methylphenyl group. Among these alkyl groups and aryl groups, a methyl group is particularly preferable.
- the functional group capable of reacting with the active terminal of the polymer chain constituting X 1 , X 2 and X 4 is not particularly limited, but is a hydrocarbon group containing an alkoxyl group having 1 to 5 carbon atoms or a 2-pyrrolidonyl group. And a group having 4 to 12 carbon atoms and containing an epoxy group is preferable.
- alkoxyl group having 1 to 5 carbon atoms examples include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, and a butoxy group. Of these, a methoxy group is preferable.
- Preferred examples of the hydrocarbon group containing a 2-pyrrolidonyl group include a group represented by the following general formula (6).
- j is an integer of 2 to 10. In particular, j is preferably 2.
- Examples of the group having 4 to 12 carbon atoms having an epoxy group include groups represented by the following general formula (7). -Z 1 -Z 2 -E (7)
- Z 1 is an alkylene group or alkylarylene group having 1 to 10 carbon atoms
- Z 2 is a methylene group, a sulfur atom, or an oxygen atom
- E is a carbon number having an epoxy group. 2 to 10 substituted hydrocarbon groups.
- Z 2 is an oxygen atom
- Z 2 is an oxygen atom
- E is a glycidyl group
- Z 1 is an alkylene group having 3 carbon atoms
- X 1 , X 2 and X 4 is a hydrocarbon group containing a 2-pyrrolidonyl group
- the carbon-oxygen bond of the carbonyl group constituting the 2-pyrrolidonyl group is dissociated, and a structure in which the polymer chain is bonded to the carbon atom is considered to be formed.
- X 1 , X 2 and X 4 has 4 to 12 carbon atoms containing an epoxy group.
- the carbon-oxygen bond constituting the epoxy ring is dissociated to form a structure in which the polymer chain is bonded to the carbon atom.
- X 1 and X 4 are preferably a group having 4 to 12 carbon atoms or an alkyl group having 1 to 6 carbon atoms containing an epoxy group.
- X 2 is preferably a group having 4 to 12 carbon atoms containing an epoxy group.
- the group represented by the following general formula (8) is preferable as the group containing X 3 , that is, a repeating unit of 2 to 20 alkylene glycol.
- t is an integer of 2 to 20
- P is an alkylene group or alkylarylene group having 2 to 10 carbon atoms
- R 20 is a hydrogen atom or a methyl group
- Q is a carbon number. 1 to 10 alkoxyl groups or aryloxy groups.
- t is an integer of 2 to 8
- P is an alkylene group having 3 carbon atoms
- R is a hydrogen atom
- Q is a methoxy group
- m is an integer of 3 to 200, preferably 20 to 150, more preferably 30 to 120.
- n is an integer of 0 to 200, preferably an integer of 0 to 150, more preferably an integer of 0 to 120.
- k is an integer of 0 to 200, preferably an integer of 0 to 150, more preferably an integer of 0 to 120.
- the total number of m, n, and k is preferably 400 or less, more preferably 300 or less, and particularly preferably 250 or less.
- R 9 to R 19 and X 5 to X 11 are also R 1 to R 8 and X 1 to X 1 in the general formula (1). It may be similar to the X 4.
- the amount of the modifier used is usually more than 0.001 mol and less than 0.1 mol, preferably more than 0.005 mol and less than 0.09 mol with respect to 1 mol of the polymerization initiator used. More preferably, it is more than 0.01 mol and less than 0.08 mol.
- a modifier it dissolves in an inert solvent used in the polymerization, so that the active ends of the polymer chain having active ends and the modifier easily react uniformly.
- the solution concentration is preferably 1 to 50% by weight.
- the timing when the modifier is reacted with the polymer chain having an active end is preferably when the polymerization reaction is almost completed. After the polymerization reaction is almost completed, the polymer chain having an active end is gelled by a side reaction or polymerized. It is preferably before undergoing a chain transfer reaction due to impurities in the system.
- a commonly used coupling agent is added to the polymerization system to the extent that the effect of the present invention is not hindered. A part of the terminal may be inactivated.
- the conditions for reacting the modifier with the polymer chain having an active end are the reaction temperature is usually 0 to 100 ° C., preferably 30 to 90 ° C., and the reaction time is usually 1 to 120 minutes. The range is preferably 2 to 60 minutes.
- the rubber composition for tires of the present invention contains 15 to 55% by weight, preferably 20 to 55% by weight, more preferably 25 to 55% by weight of the above-mentioned terminally modified group-containing cyclic olefin ring-opening polymer, based on all rubber components. Contains 55% by weight.
- the rubber composition for tires of the present invention contains 45 to 85% by weight, preferably 45 to 80% by weight, more preferably 45% by weight, of the above-mentioned terminal-modified group-containing solution polymerization conjugated diene polymer based on the total rubber component. Contains 45-75% by weight.
- This ratio is determined based on the weight of the polymer constituting the rubber component of the terminally modified group-containing cyclic olefin ring-opening polymer and the terminally modified group-containing solution polymerization conjugated diene polymer. The weight of is excluded.
- the rubber composition for tires of the present invention may contain a rubber other than the terminal modified group-containing cyclic olefin ring-opening polymer and the terminal modified group-containing solution-polymerized conjugated diene polymer as a rubber component.
- rubber other than the terminally modified group-containing cyclic olefin ring-opening polymer and the terminally modified group-containing solution-polymerized conjugated diene polymer include, for example, natural rubber (NR), polyisoprene rubber (IR), emulsion polymerization SBR (emulsion polymerization styrene).
- Butadiene rubber low cis BR (polybutadiene rubber), high cis BR, high trans BR (trans bond content of butadiene portion 70 to 95%), styrene-isoprene copolymer rubber, butadiene-isoprene copolymer rubber, emulsion-polymerized styrene -Acrylonitrile-butadiene copolymer rubber, acrylonitrile-butadiene copolymer rubber, polyisoprene-SBR block copolymer rubber, polystyrene-polybutadiene-polystyrene block copolymer, acrylic rubber, epichlorohydrin rubber, fluorine rubber, silicon rubber, ethylene- Propire Rubber, such as urethane rubber, and the like.
- NR, BR, IR, and emulsion polymerization SBR are preferably used. These rubbers can be used alone or in combination of two or more. However, from the viewpoint of improving the wear resistance and low heat build-up of the crosslinked rubber obtained from the tire rubber composition of the present invention, the terminal-modified group-containing cyclic olefin in the tire rubber composition of the present invention is opened.
- the content of rubber other than the ring polymer and the terminally modified group-containing solution-polymerized conjugated diene polymer is preferably 40% by weight or less, preferably 35% by weight or less, based on the total rubber component, 30 More preferably, it is less than or equal to weight percent.
- the rubber composition for tires of the present invention contains silica in addition to the above-mentioned terminally modified group-containing cyclic olefin ring-opening polymer and terminally modified group-containing solution-polymerized conjugated diene polymer.
- the silica is not particularly limited, and examples thereof include dry method white carbon, wet method white carbon, colloidal silica, and precipitated silica.
- Silica has a nitrogen adsorption specific surface area of preferably 50 to 300 m 2 / g, more preferably 80 to 220 m 2 / g, and particularly preferably 100 to 170 m 2 / g. When the specific surface area is within this range, the resulting rubber cross-linked product can be made more excellent in low heat build-up.
- the pH of the silica is preferably less than 7, more preferably 5 to 6.9.
- the nitrogen adsorption specific surface area can be measured by the BET method in accordance with ASTM D3037-81.
- the compounding amount of silica in the rubber composition for tires of the present invention is 30 to 200 parts by weight, preferably 40 to 150 parts by weight, more preferably 50 to 100 parts by weight with respect to 100 parts by weight of the rubber component. It is. When there are too few compounding quantities of a silica, the wet grip property and abrasion resistance of the rubber crosslinked material obtained will deteriorate. On the other hand, if the amount is too large, the low heat build-up will deteriorate.
- the tire rubber composition of the present invention further contains a silane coupling agent containing a monosulfide group and / or a thiol group.
- a silane coupling agent containing a monosulfide group and / or thiol group examples include 3-octanoylthio-1-propyl-triethoxysilane, 3-octanoylthio-1-propyl-trimethoxysilane, and 3-mercaptopropyltrimethoxysilane.
- a compound represented by the formula (10) used in the examples described later (in the formula (10), L is each independently an alkanediyl group or alkenediyl group having 1 to 9 carbon atoms, and x is 1 to And an integer of 1 to 150), and a compound represented by the formula (11).
- These silane coupling agents can be used alone or in combination of two or more.
- the amount of the silane coupling agent containing a monosulfide group and / or thiol group in the tire rubber composition of the present invention is 0.3 to 20 parts by weight, preferably 100 parts by weight of silica. 1 to 15 parts by weight, more preferably 5 to 15 parts by weight. If the amount of the silane coupling agent is too small, the wear resistance and low heat build-up of the resulting rubber cross-linked product will be deteriorated. On the other hand, if the amount is too large, slipping will occur during kneading, resulting in poor dispersion of the compounding agent. It becomes a thing.
- the tire rubber composition of the present invention may further contain carbon black as a filler.
- carbon black include furnace black, acetylene black, thermal black, channel black, and graphite.
- furnace black is preferably used, and specific examples thereof include SAF, ISAF, ISAF-HS, ISAF-LS, IISAF-HS, HAF, HAF-HS, HAF-LS, T-HS, T -NS, MAF, FEF and the like. These may be used alone or in combination of two or more.
- Carbon black has a nitrogen adsorption specific surface area of preferably 5 to 200 m 2 / g, more preferably 20 to 130 m 2 / g, and still more preferably 40 to 80 m 2 / g.
- the amount of dibutyl phthalate (DBP) adsorbed by carbon black as a filler is preferably 5 to 200 ml / 100 g, more preferably 50 to 160 ml / 100 g, and still more preferably 70 to 130 ml / 100 g.
- the amount of carbon black used as a filler is preferably 1 to 150 parts by weight, more preferably 2 to 120 parts by weight, and still more preferably 100 parts by weight of the rubber component in the tire rubber composition. 5 to 100 parts by weight.
- the rubber composition for tires of the present invention comprises a crosslinking agent, a crosslinking accelerator, a crosslinking activator, an anti-aging agent, an activator, a process oil, a plasticizer, a lubricant, and a filler according to a conventional method.
- Tackifiers, aluminum hydroxide and other compounding agents can be blended in the required amounts.
- crosslinking agent examples include sulfur, sulfur halide, organic peroxide, quinonedioximes, organic polyvalent amine compounds, and alkylphenol resins having a methylol group. Of these, sulfur is preferably used.
- the amount of the crosslinking agent is preferably 1.0 to 5.0 parts by weight, more preferably 1.2 to 4.0 parts by weight, particularly preferably 100 parts by weight of the rubber component in the tire rubber composition. Is 1.4 to 3.0 parts by weight.
- crosslinking accelerator examples include N-cyclohexyl-2-benzothiazolylsulfenamide, Nt-butyl-2-benzothiazolylsulfenamide, N-oxyethylene-2-benzothiazolylsulfenamide, Sulfenamide crosslinking accelerators such as N-oxyethylene-2-benzothiazolylsulfenamide and N, N′-diisopropyl-2-benzothiazolylsulfenamide; diphenylguanidine, diortolylguanidine, orthotolylbi Guanidine-based crosslinking accelerators such as guanidine; thiourea-based crosslinking accelerators; thiazole-based crosslinking accelerators; thiuram-based crosslinking accelerators; dithiocarbamic acid-based crosslinking accelerators; xanthogenic acid-based crosslinking accelerators; Among these, those containing a sulfenamide-based crosslinking accelerator are particularly preferable
- crosslinking accelerators are used alone or in combination of two or more.
- the amount of the crosslinking accelerator is preferably 0.1 to 15 parts by weight, more preferably 0.5 to 5 parts by weight, and particularly preferably 1. parts by weight with respect to 100 parts by weight of the rubber component in the tire rubber composition. 0 to 4.0 parts by weight.
- cocoon crosslinking activators include higher fatty acids such as stearic acid and zinc oxide.
- the blending amount of the crosslinking activator is not particularly limited, but the blending amount when a higher fatty acid is used as the crosslinking activator is preferably 0.05 with respect to 100 parts by weight of the rubber component in the tire rubber composition. 15 to 15 parts by weight, more preferably 0.5 to 5 parts by weight.
- zinc oxide is used as the crosslinking activator, the amount is preferably 100 parts by weight of the rubber component in the tire rubber composition. Is 0.05 to 10 parts by weight, more preferably 0.5 to 3 parts by weight.
- drought process oils include paraffinic, aromatic and naphthenic petroleum softeners; plant softeners; fatty acids.
- other compounding agents include activators such as diethylene glycol, polyethylene glycol, and silicone oil; fillers such as calcium carbonate, talc, and clay; tackifiers such as petroleum resins and coumarone resins; and waxes.
- each component may be kneaded according to a conventional method.
- a compounding agent excluding a crosslinking agent and a crosslinking accelerator and a rubber component are kneaded, and then the kneaded product is mixed.
- a desired composition can be obtained by mixing a crosslinking agent and a crosslinking accelerator.
- the kneading temperature of the compounding agent excluding the crosslinking agent and crosslinking accelerator and the rubber component is preferably 80 to 200 ° C, more preferably 120 to 180 ° C.
- the kneading time is preferably 30 seconds to 30 minutes.
- Mixing of the kneaded material, the crosslinking agent and the crosslinking accelerator is usually performed after cooling to 100 ° C. or lower, preferably 80 ° C. or lower.
- a method of adding a compounding agent to solid rubber and kneading dry kneading method
- a compounding agent is added to a rubber solution, and then solidified and dried. Any of the methods (wet kneading method) to be used.
- the rubber cross-linked product obtained by cross-linking the rubber composition for tires of the present invention is excellent in wear resistance and low heat build-up, and therefore, for example, in various tires such as all-season tires, high-performance tires, studless tires, treads, carcass Although it can be used for tire parts such as sidewalls and bead parts, it is particularly suitably used for tire treads.
- the rubber cross-linked product of the present invention can effectively suppress wear in a region with a low slip rate (particularly excellent in wear resistance in a region with a low slip rate). It can be effectively suppressed.
- Glass transition temperature (Tg) of cyclopentene ring-opening polymer Using a differential scanning calorimeter (DSC, manufactured by PerkinElmer), the temperature was raised from 23 ° C. to 120 ° C. (heating rate 100 ° C./min), held at 120 ° C. for 10 minutes, and cooled to ⁇ 120 ° C. (cooling rate 100) (° C / min), -120 ° C held for 10 minutes, temperature increased to 23 ° C (heating rate 10 ° C / min) in this order, and the average value of the onset value twice the glass transition temperature The measured value was used.
- DSC differential scanning calorimeter
- Glass transition temperature (Tg) of styrene butadiene isoprene rubber Using a differential scanning calorimeter (DSC, manufactured by PerkinElmer), the temperature was raised from 23 ° C. to 120 ° C. (heating rate 100 ° C./min), held at 120 ° C. for 10 minutes, and cooled to ⁇ 120 ° C. (cooling rate 100) (° C / min), -120 ° C held for 10 minutes, temperature increased to 23 ° C (heating rate 10 ° C / min) in this order, and the average value of the onset value twice the glass transition temperature The measured value was used.
- DSC differential scanning calorimeter
- Mooney viscosity of styrene butadiene isoprene rubber The Mooney viscosity (polymer Mooney) of styrene butadiene isoprene rubber was measured according to JIS K6300 (unit: (ML 1 + 4 , 100 ° C.)).
- the obtained terminal-modified cyclopentene ring-opening polymer (a1) was measured for the weight average molecular weight, cis / trans ratio, oxysilyl group introduction rate, and glass transition temperature (Tg) according to the above-described methods.
- the obtained terminal-modified cyclopentene ring-opening polymer (a1) had a weight average molecular weight of 366,000, a cis / trans ratio of 55/45, an oxysilyl group introduction rate of 143%, and a glass transition temperature (Tg) of ⁇ 106 ° C.
- the obtained terminal-modified cyclopentene ring-opening polymer (a2) was measured for the weight average molecular weight, the cis / trans ratio, the oxysilyl group introduction rate, and the glass transition temperature (Tg) according to the above methods.
- the obtained terminal-modified cyclopentene ring-opening polymer (a2) had a weight average molecular weight of 363,000, a cis / trans ratio of 52/48, an oxysilyl group introduction rate of 69%, and a glass transition temperature (Tg) of ⁇ 106 ° C.
- the obtained unmodified cyclopentene ring-opening polymer (a3) was measured for the weight average molecular weight, cis / trans ratio, oxysilyl group introduction rate, and glass transition temperature (Tg) in accordance with the above methods.
- the resulting unmodified cyclopentene ring-opening polymer (a3) had a weight average molecular weight of 389,000, a cis / trans ratio of 81/19, an oxysilyl group introduction rate of 0%, and a glass transition temperature (Tg) of ⁇ 110 ° C. .
- styrene monomer unit content, vinyl bond content of a butadiene unit part, a weight average molecular weight, and glass transition temperature (Tg) was measured.
- the resulting end-modified solution-polymerized styrene butadiene rubber (b1) has a styrene monomer unit content of 42% by weight, a vinyl bond content of the butadiene unit part of 30% by weight, a weight average molecular weight of 774,000, a glass transition temperature (Tg). ) -23 ° C.
- Example 1 30 parts of the end-modified cyclopentene ring-opening polymer (a1) obtained in Synthesis Example 1 and the oil-extended end-modified solution-polymerized styrene butadiene isoprene rubber obtained in Synthesis Example 4 in a Brabender type mixer having a capacity of 250 ml (B1) 84 parts (70 parts per terminal-modified solution-polymerized styrene butadiene isoprene rubber (b1)) are masticated for 30 seconds, and then silica (trade name “Zeosil 1165MP”, Solvay, Nitrogen adsorption specific surface area (BET method): 163 m 2 / g) 60 parts, process oil (trade name “Aromax T-DAE”, 26 parts manufactured by JX Nippon Oil & Energy), and silane coupling agent: 3-octanoylthio-1-propyltriethoxysilane (product) 6.4 parts (name
- silica trade name “Zeosil 1165MP”, manufactured by Solvay
- carbon black trade name “Seast 3”, manufactured by Tokai Carbon Co., Ltd.
- 3 parts of zinc oxide 2 parts of stearic acid, and anti-aging agent: N-phenyl-N ′-(1,3-dimethylbutyl) -p-phenylenediamine (trade name “NOCRACK 6C”, manufactured by Ouchi Shinsei Chemical Industry Co., Ltd. 2 parts were added and kneaded for a further 2.5 minutes, and the kneaded product was discharged from the mixer.
- the temperature of the kneaded product at the end of kneading was 150 ° C.
- Example 2 The amount of the end-modified cyclopentene ring-opening polymer (a1) obtained in Synthesis Example 1 was changed from 30 parts to 50 parts, and the oil-extended end-modified solution-polymerized styrene butadiene isoprene rubber (b1) obtained in Synthesis Example 4 Example 1 except that the blending amount was changed from 84 parts to 60 parts (50 parts per terminal-modified solution-polymerized styrene butadiene isoprene rubber (b1)) and the process oil was blended from 26 parts to 30 parts, respectively.
- a sheet-like rubber composition was obtained by the same method. The obtained rubber composition was evaluated for wear resistance and low heat build-up according to the above method. The results are shown in Table 1.
- Example 3 As a silane coupling agent, instead of 3-octanoylthio-1-propyltriethoxysilane, a silane coupling agent represented by the following formula (10) (trade name “NXTZ-45”, manufactured by Momentive Performance Materials, Inc.
- Example 4 As a silane coupling agent, instead of 3-octanoylthio-1-propyltriethoxysilane, 6.4 parts of a silane coupling agent represented by the following formula (11) (trade name “VP-Si363”, manufactured by Evonik) A sheet-like rubber composition was obtained in the same manner as in Example 1 except that was used. The obtained rubber composition was evaluated for wear resistance and low heat build-up according to the above method. The results are shown in Table 1.
- a silane coupling agent represented by the following formula (11) (trade name “VP-Si363”, manufactured by Evonik)
- Example 5 In place of silica (trade name “Zeosil 1165MP”, manufactured by Solvay), silica (trade name “Zeosil Premium 200MP”, manufactured by Rhodia, nitrogen adsorption specific surface area (BET method): 220 m 2 / g) and silane coupling are used.
- Agent A sheet-like rubber composition was obtained in the same manner as in Example 1 except that the amount of 3-octanoylthio-1-propyltriethoxysilane was changed from 6.4 parts to 8 parts. The obtained rubber composition was evaluated for wear resistance and low heat build-up according to the above method. The results are shown in Table 1.
- Example 6 The blending amount of silica is from 80 parts to 45 parts, the blending amount of carbon black is from 10 parts to 45 parts, and the blending amount of silane coupling agent: 3-octanoylthio-1-propyltriethoxysilane is from 6.4 parts to 3.
- a sheet-like rubber composition was obtained in the same manner as in Example 1 except that the amount was changed to 6 parts. The obtained rubber composition was evaluated for wear resistance and low heat build-up according to the above method. The results are shown in Table 1.
- Example 7 The same as Example 1 except that the terminal-modified cyclopentene ring-opening polymer (a2) obtained in Synthesis Example 2 was used instead of the terminal-modified cyclopentene ring-opening polymer (a1) obtained in Synthesis Example 1.
- a sheet-like rubber composition was obtained.
- the obtained rubber composition was evaluated for wear resistance and low heat build-up according to the above method. The results are shown in Table 1.
- the blending amount of silica is from 80 parts to 10 parts
- the blending amount of carbon black is from 10 parts to 80 parts
- the blending amount of silane coupling agent: 3-octanoylthio-1-propyltriethoxysilane is from 6.4 parts to 1.
- a sheet-like rubber composition was obtained in the same manner as in Example 1 except that the amount was changed to 6 parts.
- the obtained rubber composition was evaluated for wear resistance and low heat build-up according to the above method. The results are shown in Table 1.
- the rubber composition for a tire comprising a predetermined amount of silica and a silane coupling agent containing a monosulfide group and / or a thiol group has wear resistance (particularly, wear resistance in a region where the slip ratio is low). And a rubber cross-linked product excellent in low heat build-up (Examples 1 to 7).
- a rubber composition comprising a styrene butadiene rubber having a styrene monomer unit content and glass transition temperature lower than the predetermined range of the present invention, and a rubber comprising an unmodified cyclopentene ring-opening polymer Composition, rubber composition containing a modified cyclopentene ring-opening polymer in an amount outside the predetermined range of the present invention, rubber containing a silane coupling agent having no monosulfide group and / or thiol group
- the obtained rubber cross-linked product was inferior in the balance between wear resistance and low heat build-up (Comparative Examples 1 to 7).
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Abstract
Description
上記のタイヤ用ゴム組成物では、前記末端変性基含有溶液重合共役ジエン系重合体が、活性末端を有する溶液重合共役ジエン系重合体鎖に、下記一般式(1)~(3)で表される化合物のうち、少なくとも一つの化合物を反応させることにより導入された基を有するものであることが好ましい。
上記のタイヤ用ゴム組成物では、前記シリカの窒素吸着比表面積が、50~300m2/gであることが好ましい。
上記のタイヤ用ゴム組成物では、前記ゴム成分100重量部に対して、1~150重量部のカーボンブラックをさらに含有することが好ましい。
前記ゴム成分100重量部に対する、前記シリカの含有量が30~200重量部であり、前記シリカ100重量部に対する、前記モノスルフィド基および/またはチオール基を含むシランカップリング剤の含有量が0.3~20重量部であるゴム組成物である。
(式(4)中、R21およびR22は、炭素数1~20の炭化水素基を表し、pは、0<p<3である。)
スリップ率=(Vs -Vd )÷Vs ×100(%)
Vs :ゴム試験片の周面の速度(周速) (cm/min)
Vd :砥石の周速(cm/min)
-Z1-Z2-E (7)
上記一般式(7)中、Z1は、炭素数1~10のアルキレン基またはアルキルアリーレン基であり、Z2はメチレン基、硫黄原子、または酸素原子であり、Eはエポキシ基を有する炭素数2~10の置換炭化水素基である。これらの中でも、Z2が酸素原子であるものが好ましく、Z2が酸素原子であり、かつ、Eがグリシジル基であるものがより好ましく、Z1が炭素数3のアルキレン基であり、Z2が酸素原子であり、かつ、Eがグリシジル基であるものが特に好ましい。
テトラヒドロフランを溶媒とするゲルパーミエーションクロマトグラフィー(GPC)(GPCシステム HLC-8220(東ソー社製))により、HタイプカラムHZ-M(東ソー社製)を用い、カラム温度40℃で測定し、重合体の数平均分子量(Mn)、重量平均分子量(Mw)および分子量分布(Mw/Mn)を、ポリスチレン換算値として測定した。
13C-NMRスペクトル測定により決定した。
示差走査型熱量計(DSC,パーキンエルマー社製)を用いて、23℃から120℃まで昇温(加熱速度100℃/分)、120℃を10分間保持、-120℃まで降温(冷却速度100℃/分)、-120℃を10分間保持、23℃まで昇温(加熱速度10℃/分)の順で測定試料の温度を変化させ、オンセット値の2回平均値をガラス転移温度の測定値とした。
1H-NMRスペクトル測定により、オキシシリル基に由来するピーク積分値とシクロペンテン開環重合体主鎖中の炭素-炭素二重結合に由来するピーク積分値との比率を求め、このピーク積分値の比率とGPCによる数平均分子量(Mn)の測定値に基づいて、オキシシリル基の導入率〔(オキシシリル基が導入されたシクロペンテン開環重合体鎖末端数/シクロペンテン開環重合体鎖末端数)の百分率〕を計算した。
テトラヒドロフランを溶媒とするゲルパーミエーションクロマトグラフィー(GPC)(GPCシステムHLC-8220(東ソー社製))により、重合体の数平均分子量(Mn)、重量平均分子量(Mw)および分子量分布(Mw/Mn)を、ポリスチレン換算値として測定した。
スチレン単量体単位含有量、およびビニル結合量は、1H-NMRにより測定した。
示差走査型熱量計(DSC,パーキンエルマー社製)を用いて、23℃から120℃まで昇温(加熱速度100℃/分)、120℃を10分間保持、-120℃まで降温(冷却速度100℃/分)、-120℃を10分間保持、23℃まで昇温(加熱速度10℃/分)の順で測定試料の温度を変化させ、オンセット値の2回平均値をガラス転移温度の測定値とした。
スチレンブタジエンイソプレンゴムのムーニー粘度(ポリマームーニー)をJIS K6300に従って測定した(単位は(ML1+4、100℃))。
試料となるゴム組成物を、160℃で20分間プレス架橋して架橋された試験片を作製し、この試験片について、FPS摩耗試験機(商品名「AB-2010」、上島製作所製)を用い、荷重1kgf、スリップ率3%で測定した。この特性については、基準サンプル(後述の比較例1)を100とする指数で示した。この指数が大きいものほど、耐摩耗性(特に、スリップ率の低い領域における耐摩耗性)に優れるといえる。
試料となるゴム組成物を、160℃で20分間プレス架橋して架橋された試験片を作製し、この試験片について、粘弾性測定装置(商品名「ARES-G2」、TAインスツルメント社製)を用い、せん断歪み2.0%、周波数10Hzの条件で60℃におけるtanδを測定した。この特性については、基準サンプル(後述の比較例1)を100とする指数で示した。この指数が大きいものほど、低燃費性に優れるといえる。
ジイソブチルアルミニウムモノ(n-へキソキシド)/トルエン溶液(2.5重量%)の調製
窒素雰囲気下、攪拌子の入ったガラス容器に、トルエン88部、および25.4重量%のトリイソブチルアルミニウム/n-ヘキサン溶液(東ソー・ファインケム社製)7.8部を加えた。次いで、容器を-45℃に冷却し、激しく攪拌しながら、n-ヘキサノール1.02部(トリイソブチルアルミニウムに対して当モル量)をゆっくりと滴下した。その後、攪拌しながら室温になるまで放置し、ジイソブチルアルミニウムモノ(n-へキソキシド)/トルエン溶液(2.5重量%)を調製した。
窒素雰囲気下、攪拌子の入ったガラス容器に、1.0重量%のWCl6/トルエン溶液87部、および参考例1で調製した2.5重量%のジイソブチルアルミニウムモノ(n-ヘキソキシド)/トルエン溶液43部を加え、15分間攪拌することにより、触媒溶液を得た。そして、窒素雰囲気下、攪拌機付き耐圧ガラス反応容器に、シクロペンテン300部および1,4-ビス(トリエトキシシリル)-2-ブテン1.24部を加え、ここに、上記にて調製した触媒溶液130部を加えて、25℃で4時間重合反応を行った。4時間の重合反応後、耐圧ガラス反応容器に、過剰のエチルアルコールを加えて重合を停止した後、耐圧ガラス反応容器内の溶液を、2,6-ジ-t-ブチル-p-クレゾール(BHT)を含む大過剰のエチルアルコールに注いだ。次いで、沈殿したポリマーを回収し、エチルアルコールで洗浄後、40℃で3日間、真空乾燥することにより、78部の末端変性シクロペンテン開環重合体(a1)を得た。
窒素雰囲気下、攪拌子の入ったガラス容器に、1.0重量%のWCl6/トルエン溶液87部、および参考例1で調製した2.5重量%のジイソブチルアルミニウムモノ(n-ヘキソキシド)/トルエン溶液43部を加え、15分間攪拌することにより、触媒溶液を得た。そして、窒素雰囲気下、攪拌機付き耐圧ガラス反応容器に、シクロペンテン300部およびビニル(トリエトキシ)シラン0.42部を加え、ここに、上記にて調製した触媒溶液130部を加えて、25℃で4時間重合反応を行った。4時間の重合反応後、耐圧ガラス反応容器に、過剰のエチルアルコールを加えて重合を停止した後、耐圧ガラス反応容器内の溶液を、2,6-ジ-t-ブチル-p-クレゾール(BHT)を含む大過剰のエチルアルコールに注いだ。次いで、沈殿したポリマーを回収し、エチルアルコールで洗浄後、40℃で3日間、真空乾燥することにより、76部の末端変性シクロペンテン開環重合体(a2)を得た。
窒素雰囲気下、攪拌子の入ったガラス容器に、1.0重量%のWCl6/トルエン溶液87部、および参考例1で調製した2.5重量%のジイソブチルアルミニウムモノ(n-ヘキソキシド)/トルエン溶液43部を加え、15分間攪拌することにより、触媒溶液を得た。そして、窒素雰囲気下、攪拌機付き耐圧ガラス反応容器に、シクロペンテン300部、トルエン200部および1-ヘキセン0.12部を加え、ここに、上記にて調製した触媒溶液130部を加えて、25℃で4時間重合反応を行った。4時間の重合反応後、耐圧ガラス反応容器に、過剰のエチルアルコールを加えて重合を停止した後、耐圧ガラス反応容器内の溶液を、2,6-ジ-t-ブチル-p-クレゾール(BHT)を含む大過剰のエチルアルコールに注いだ。次いで、沈殿したポリマーを回収し、エチルアルコールで洗浄後、40℃で3日間、真空乾燥することにより、81部の未変性のシクロペンテン開環重合体(a3)を得た。
攪拌機付きオートクレーブに、窒素雰囲気下、シクロヘキサン4000g、スチレン370g、1,3-ブタジエン205g、イソプレン25gおよびテトラメチルエチレンジアミン2.7mmolを仕込んだ後、n-ブチルリチウムを、シクロヘキサン、スチレン、1,3-ブタジエンおよびイソプレンに含まれる重合を阻害する不純物の中和に必要な量を添加した。その後、n-ブチルリチウムを重合反応に用いる分として3.3mmolを加え、40℃で重合を開始した。次いで、重合を開始してから30分経過後、スチレン50g、1,3-ブタジエン335gを90分間かけて連続的に添加した。重合反応中の最高温度は75℃であった。連続添加終了後、さらに10分間重合反応を継続し、重合転化率が95%から100%の範囲になったことを確認してから、イソプレン15gを添加し10分間反応させた後、少量の重合溶液をサンプリングした。サンプリングした少量の重合溶液は、過剰のメタノールを添加して反応停止した後、風乾することで、重合体を得て、ゲルパーミエーションクロマトグラフィ分析の試料とした。サンプリングした重合体の重量平均分子量は567,000であった。
容量250mlのブラベンダータイプミキサー中で、合成例1で得られた末端変性シクロペンテン開環重合体(a1)30部、および合成例4で得られた油展された末端変性溶液重合スチレンブタジエンイソプレンゴム(b1)84部(末端変性溶液重合スチレンブタジエンイソプレンゴム(b1)当たり70部)を30秒素練りし、次いでシリカ(商品名「Zeosil1165MP」、ソルベイ社製、窒素吸着比表面積(BET法):163m2/g)60部、プロセスオイル(商品名「アロマックスT-DAE」、JX日鉱日石エネルギー社製)26部、およびシランカップリング剤:3-オクタノイルチオ-1-プロピルトリエトキシシラン(商品名「NXTシラン」、モメンティブパフォーマンスマテリアルズ社製)6.4部を添加して、110℃を開始温度として1.5分間混練後、シリカ(商品名「Zeosil1165MP」、ソルベイ社製)20部、カーボンブラック(商品名「シースト3」、東海カーボン社製)10部、酸化亜鉛3部、ステアリン酸2部、および老化防止剤:N-フェニル-N’-(1,3-ジメチルブチル)-p-フェニレンジアミン(商品名「ノクラック6C」、大内新興化学工業社製)2部を添加し、さらに2.5分間混練し、ミキサーから混練物を排出させた。混練終了時の混練物の温度は150℃であった。混練物を、室温まで冷却した後、再度ブラベンダータイプミキサー中で、110℃を開始温度として3分間混練した後、ミキサーから混練物を排出させた。次いで、50℃のオープンロールで、得られた混練物と、硫黄1.5部および架橋促進剤(シクロヘキシル-2-ベンゾチアゾリルスルフェンアミド(大内新興化学工業社製、商品名「ノクセラーCZ-G」)2部とジフェニルグアニジン(大内新興化学工業社製、商品名「ノクセラーD」)2部との混合物)4部を混練した後、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
合成例1で得られた末端変性シクロペンテン開環重合体(a1)の配合量を30部から50部に、合成例4で得られた油展された末端変性溶液重合スチレンブタジエンイソプレンゴム(b1)の配合量を84部から60部(末端変性溶液重合スチレンブタジエンイソプレンゴム(b1)当たり50部)に、プロセスオイルの配合量を26部から30部に、それぞれ変更した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
シランカップリング剤として、3-オクタノイルチオ-1-プロピルトリエトキシシランの代わりに、下記式(10)で表されるシランカップリング剤(商品名「NXTZ-45」、モメンティブパフォーマンスマテリアルズ社製、下記式(10)中、x:y=55:45(モル%))6.4部を使用した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
シランカップリング剤として、3-オクタノイルチオ-1-プロピルトリエトキシシランの代わりに、下記式(11)で表されるシランカップリング剤(商品名「VP-Si363」、エボニック社製)6.4部を使用した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
シリカ(商品名「Zeosil1165MP」、ソルベイ社製)に代えて、シリカ(商品名「ZeosilPremium200MP」、ローディア社製、窒素吸着比表面積(BET法):220m2/g)を使用するとともに、シランカップリング剤:3-オクタノイルチオ-1-プロピルトリエトキシシランの配合量を6.4部から8部に変更した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
シリカの配合量を80部から45部に、カーボンブラックの配合量10部から45部に、シランカップリング剤:3-オクタノイルチオ-1-プロピルトリエトキシシランの配合量を6.4部から3.6部に変更した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
合成例1で得られた末端変性シクロペンテン開環重合体(a1)に代えて、合成例2で得られた末端変性シクロペンテン開環重合体(a2)を使用した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
合成例4で得られた油展された末端変性溶液重合スチレンブタジエンイソプレンゴム(b1)84部に代えて、変性スチレンブタジエンゴム(商品名「Nipol NS612」、日本ゼオン社製、スチレン単量体単位含有量15重量%、ブタジエン単位部分のビニル結合含有量30%、ムーニー粘度(ML1+4,100℃)62、ガラス転移温度(Tg)-65℃、伸展油は含有しない)70部を使用するとともに、プロセスオイルの配合量を26部から40部に変更した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
合成例4で得られた油展された末端変性溶液重合スチレンブタジエンイソプレンゴム(b1)84部に代えて、未変性スチレンブタジエンゴム(商品名「Nipol SBR1723」、日本ゼオン社製、スチレン単量体単位含有量23.5重量%、ブタジエン単位部分のビニル結合含有量16%、ムーニー粘度(ML1+4,100℃)47、ガラス転移温度(Tg)-50℃)、ゴム成分を構成する重合体100部に対して37.5部の伸展油を含有)96部(未変性スチレンブタジエンゴム当たり60部)を使用するとともに、プロセスオイルの配合量を26部から14部に変更した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
合成例1で得られた末端変性シクロペンテン開環重合体(a1)に代えて、合成例3で得られた末端変性シクロペンテン開環重合体(a3)を使用するとともに、合成例4で得られた油展された末端変性溶液重合スチレンブタジエンイソプレンゴム(b1)84部に代えて、未変性スチレンブタジエンゴム(商品名「Nipol NS460」、日本ゼオン社製、スチレン単量体単位含有量25重量%、ブタジエン単位部分のビニル結合含有量63%、ガラス転移温度-25℃、ムーニー粘度(ML1+4,100℃)49、ゴム成分を構成する重合体100部に対して37.5部の伸展油を含有)96部(未変性スチレンブタジエンゴム当たり60部)を使用し、かつ、プロセスオイルの配合量を26部から14部に変更した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
合成例1で得られた末端変性シクロペンテン開環重合体(a1)の配合量を30部から10部に、合成例4で得られた油展された末端変性溶液重合スチレンブタジエンイソプレンゴム(b1)の配合量を84部から108部(末端変性溶液重合スチレンブタジエンイソプレンゴム(b1)当たり90部)に、プロセスオイルの配合量を26部から22部に、それぞれ変更した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
合成例1で得られた末端変性シクロペンテン開環重合体(a1)の配合量を30部から70部に、合成例4で得られた油展された末端変性溶液重合スチレンブタジエンイソプレンゴム(b1)の配合量を84部から36部(末端変性溶液重合スチレンブタジエンイソプレンゴム(b1)当たり30部)に、プロセスオイルの配合量を26部から34部に、それぞれ変更した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
シリカの配合量を80部から10部に、カーボンブラックの配合量10部から80部に、シランカップリング剤:3-オクタノイルチオ-1-プロピルトリエトキシシランの配合量を6.4部から1.6部に変更した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
シランカップリング剤として、3-オクタノイルチオ-1-プロピルトリエトキシシランの代わりに、ビニルトリエトキシラン(商品名「KBE-1003」、信越化学工業社製)6.4部を使用した以外は、実施例1と同様の方法で、シート状のゴム組成物を得た。そして、得られたゴム組成物について、上記方法に従い、耐摩耗性および低発熱性の評価を行なった。結果を表1に示す。
一方、本発明所定の範囲よりも低いスチレン単量体単位含有量およびガラス転移温度を有するスチレンブタジエンゴムを含有してなるゴム組成物や、未変性のシクロペンテン開環重合体を含有してなるゴム組成物、本発明所定の範囲から外れた量の変性シクロペンテン開環重合体を含有してなるゴム組成物、モノスルフィド基および/またはチオール基を有さないシランカップリング剤を含有してなるゴム組成物では、得られるゴム架橋物は、耐摩耗性、低発熱性のバランスに劣るものであった(比較例1~7)。
Claims (8)
- ガラス転移温度が-120~-90℃である末端変性基含有環状オレフィン開環重合体15~55重量%と、ガラス転移温度が-60~-10℃であり、芳香族ビニル単量体単位の含有割合が30重量%超、50重量%以下である末端変性基含有溶液重合共役ジエン系重合体45~85重量%とを含むゴム成分と、
シリカと、
モノスルフィド基および/またはチオール基を含むシランカップリング剤とを含有し、
前記ゴム成分100重量部に対する、前記シリカの含有量が30~200重量部であり、前記シリカ100重量部に対する、前記モノスルフィド基および/またはチオール基を含むシランカップリング剤の含有量が0.3~20重量部であるタイヤ用ゴム組成物。 - 前記末端変性基含有環状オレフィン開環重合体が、重合体鎖の末端にオキシシリル基が導入された重合体である請求項1に記載のタイヤ用ゴム組成物。
- 前記末端変性基含有溶液重合共役ジエン系重合体が、活性末端を有する溶液重合共役ジエン系重合体鎖に、下記一般式(1)~(3)で表される化合物のうち、少なくとも一つの化合物を反応させることにより導入された基を有するものである請求項1または2に記載のタイヤ用ゴム組成物。
- 前記末端変性基含有溶液重合共役ジエン系重合体が、共役ジエン単量体単位として、1,3-ブタジエン単位およびイソプレン単位を含有する請求項1~3のいずれかに記載のタイヤ用ゴム組成物。
- 前記シリカの窒素吸着比表面積が、50~300m2/gである請求項1~4のいずれかに記載のタイヤ用ゴム組成物。
- 前記ゴム成分100重量部に対して、1~150重量部のカーボンブラックをさらに含有する請求項1~5のいずれかに記載のタイヤ用ゴム組成物。
- 請求項1~6のいずれかに記載のタイヤ用ゴム組成物を架橋してなるゴム架橋物。
- 請求項7に記載のゴム架橋物を含んでなるタイヤ。
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